Thermostatic regulating device.



I. HALL. THEEMOSTATIO BEGULATING' DEVICE.

APPLICATION FILED SEPT. 16, 1913.

Patented Feb. 16, 1915.

r I I warm 4r romav I, HALL.

THEBMOSTATIC RBGULAIING DEVICE.

APPLIOATION FILED SEPT. 16, 1913 Patented Feb. 16, 1915 2 SHEETS-SHEET 2.

Jrrslrm #414 Aha.

If wV/I/II/I l/l/l/lf/ 3 Irronmer fluence of such burner.

iSAIAH HALL, OF BIRMINGHAM, ENGLANT -THERMOSTATIC REGULATING DEVICE,

Specification of Letters Patent,

Fate-uteri Feb. 16, 191 5.

AppHcation flled September is, 191a Serial tic. 790,046.

To all whom it mag concern Be it lmown that I, ISAIAH HALL, a subject of the King of Great Britain, residing at Exchan e Buildings, New street, Birmingham, ngland, have invented a new and useful Thermostatic Regulating Device; and I do hereby declare the following to be a full, clear, and exact description of the same. g

This invention relates to furnaces for melting metal, more especially such as are used for the melting of used metal, cleansing it and subsequently casting it; and is particularly adapted for use in the melting of ty )e metal.

1 he object of this invention is to provide a furnace comprising means for regulating and also if desired for indicating the temperature of the molten material. In the accompanying drawings forming a 'part hercof:--Figure 1 is a view illustrating the temperature regulating and indicating device and showing the gas supply box with the cover removed. Fig. 2 is a vertical section at AB in Fig. 4. Fig. 3 is a longitudinal section through the controlling members which are exposed to the metal of the furnace. Fig. 4 illustrates the indicating mechanism with the dial plate removed.

In carrying my invention into practice as illustrated upon, the accompanying drawings gas is supplied by the pipe 18, and passes through the valve seating 19 and into the chest 20 when the valve 21 is away from the seating, the gas passing out from the chest by way of the pipe 22 to the burner which is to be regulated in accordance with the variation in the temperature of the ma terial which is exposed to the heating in- The'chest is preferably made of aluminium and carries a cover plate 28 which is secured to the chest by screws taken. into holes 23 whereby the chest is sealed in a gas tight manner, The chest carries two levers one of which 24 is pivotally mounted .at 23 having a short length at the left hand end and it long length at the right han end so arranged that a small movement 0' the former gives a large movement at the right hand end. Parallel with this first lever is a second lever 26 pivoted at its end 27 and carrying at its opposite end a valve 21 this lever. 26being supported upon the lever 24 by a projecting pin 29, while the lever 24 is normall raised by the spring 30. it will thus be seen that when the left hand end of the lever 24 receives a slight movement say a falling movement the. right hand endof the lever will rise lifting the lever 26 the left hand end of which risesbut with a much greater movement bringing the valve 28 toward its seating and itunay entirely close the valve if the movement'is sufficient, leaving only a small passage or port for keeping the burner alight, which passage may be adjustable in area if so desired.

Immediately beneath the left hand end of the lever 24 is a tube 31' which dips into the metal pot, this tube being provided with a closure plug 32. \Vithin this tube is a stick 33 of graphite, carbon, plumbago or the like non-metallic refractory material'having a 1 relatively small co-eflicient of expansion compared with the co-ellicient of expansion of the metal tube and above this carbon stick is a metal rod 34 the upper end of which abuts against the under edge of the left hand,

portion. of the lever 2%, while theloweredge rests upon. the top of the carbon stick 33. Around this metal rod is a spring 35 abutting against the collarfiu, and the bottom of the chest, this spring maintnining' the rod and the carbon against the plug 32. i

As previously stated: the lower endof the tube 31 dips into thehnolten metal in the metal pot and it will be obvious that the tube and the carbon stick will expand ac cording to the temperature of the molt metal but the tube is of metal of a hi hcr co-efiicient of expansion than the carbon stick it willbe obvious that the effect will be to lower the top end oi" metal rod 34 which willallow the left d end of the lever 24 to fall under the influence of the spring 30 thus tending to close the valve as the temperature in the metal pot and opening the valve when the temperature falls.

The valve seating 19 is ad ustable under the influence ofthe screw 37 controlled the head 38, which screws into a bar extend as the screw abutting against the upper edge of the lever 26 and whereby said lever may be depressed.

The temperature indicating mechanism 18 contained in a casing 40 and is controlled by a rod 41, the lower end of which rests on the right hand end of the lever 24. The casing includes a dial plate in the centenof which is a shaft 42 carrying an lndicating pointer 43 and to this shaft is also connected a crank 44. Pivoted to the casing at 45 is a lever 46 which is connected to the crank 44 b a link 47 in such manner that when the eft hand end of the lever 46 1s raised the crank is moved to rotate the shaft 42 and the indicating pointer 43. Immediately above the .rod 41 is a. pivoted member 48 one extremity of which abuts aga nst the left hand end of said' lever 4f 5, being so arrangedthat when the rod 41 rises, the lever 46 is operated to move theundwator, said lever being returned to its initlal position by the spring 49.

The Indicating ial is calibrated according tothe temperature range for wh ch the apparatus is to be used so that as the temsatiire rises and falls the rod 31 Will move, indicati such tem"eratures.

Instea of the lin and lever'mechanism for controlling the indicator illustrated in Fig. 1 any other equivalent arrangement might be used.

What I claim is 1. In a thermostatic regulating device, the combination of a gaschamber; a differential expansion' device extending from the gas chamber; a lever pivoted within said gas chamber having its short end in contact with said difi'erential expansion device; an abutment carried by the long end of said lever; -a spring controlling said lever and retaining said short end in engagement with the differential expansion de ice; a second lever pivoted at one end and engaged by said abutment; a sliding rod abutting against one of said levers; a visual indicat- 'ing device controlled by said sliding rod responding to changes in the position of the said lever and serving to show the temperaturelrwithin the furnace; a valve seating;

and a-"valve carried by said second lever.

2.;5'In a thermostatic regulating device the fihbination of a gas chamber; a differen tigl 'expansion device extending from the gas'fchainberpa lever pivoted within said gas fiffiftiib'er having its short end in contact with said differential expansion device; a second lever pivoted at one end and engaged by'said lever; a sliding rod abutting against one of said levers; a visual indicating device controlled by said sliding rod responding to changes 'in the position of the said lever and serving to,show the temperature within the furnace; a valve seating; and a gvalve carried by said second lever.

posed around said metal rod and retaining said rod in contact with the said refractory stick; a lever pivoted within said gas chamber having its short endv in contact with the end of the said metal rod; an abutment carried by the lon end of said lever; a spring controlling sai lever and retaining said short end in engagement with the metal lever pivoted at one end and rod; a second engaged by said abutment; a valve seating ad ustable Within said gas chamber; a screw engaging said valve seating; a head on said screw located exteriorly of said gas chamher and serving when rotated to adjust the position of the said valve seating; a valve carried by said second lever; an adjustable screwed rod for preventing complete closure one of said levers; and a visual indicating device controlled by said sliding rod responding to changes in theposition of the said levers and serving to show the temperature within the furnace. v I

- 4. In a thermostatic regulating device, the combination of a gas chamber; a valve;

means for adjusting the position of thevalve seating to enable the moment of cut ofl to be set as desired; a pivoted lever carrying said valve; a spring connected to sa d lever tending to close the valve; a second pivoted lever engaging the first lever; a metal tube extending from the gas chamber into the furnace; a stick of non-metallic refractory material having a different coefficient of expansion to the metal tube and located inside said tube; a metal rod located between the end of said stick and the second lever aforementioned so arranged that-thevalve opens and closes asthe temperature in the metal furnace falls and rises respectively; an indicating device; a pointer carried by a shaft; a rod resting upon the aforementioned lever carrying the valve and a system of levers having movement responsive to the movement of the valve carrying lever and serving to control the position of the pointer.

5. In a thermostatic regulating device,

the combination of a gas chamber; a valve;

means for adjusting the position of the valve' seating operative while the furnace 31d gas supply are in use for enabling the oment of cut oil to be set as desired; a pivoted lever carrying said valve; a spring of the valve; a sliding rod abutting against i connected to said lever tending to close the no valve; 9. second pivoted lever engaging the first lever; a metal tube extending from the gas chamber; a stick 0 f 'actory material having clent of expansion to the f non-metallic rea different co-efiimetal tube and located inside said tube; and a metal rod located between the end of second lever aforementi that the valve opens and said stick and the oned so arranged closes asthe temperature in the metal furnace falls and rises 10 res ectively.

n testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

SAIAH HALL. Witnesses: HAROLD J. C Foannsrnn, EVAN L. W. BYRNE. 

